Past year daily cannabis use varied significantly between 2002 and 2012 χ2(10, N = 614,579) = 13.42, p<0.001, and when comparing 2002 and 2012 directly, the prevalence of daily use increased significantly between 2002 and 2012 among the population overall (1.3% vs. 2.1%) χ2(1, N = 109,347) = 37.55, p<0.001 (Table 4b). Significant variations in the prevalence daily use were observed among individuals age 18–25 χ2(10, N = 204,570) = 9.22, p<0.001, age 26–49 χ2(10, N = 149,457) = 6.74, p<0.001, age 50+ χ2(10, N = 60,802) = 3.64, p<0.001. Whites overall χ2(10, N = 391,745) = 9.15, p<0.001, as well as the same age subgroups as the overall sample reported significant variation in the prevalence of past year daily cannabis use. Additionally, the prevalence of daily cannabis use varied significantly between 2002 and 2012 among Blacks age 18–25 χ2(10, N = 27,045) = 4.36, p<0.001, Hispanics overall χ2(10, N = 94,578) = 4.10, p<0.001, and Hispanics age 18–25 χ2(10, N = 34,452) = 3.57, p<0.001.
